Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5958b93286cc357…

MALICIOUS

PDF

92.4 KB Created: 2021-09-08 06:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c398c657f4e2855fa471bb11ccf9af1 SHA-1: bbb054a670349f9885c46261a1bfd48bde189ad8 SHA-256: e5958b93286cc357974cf063bb50fc4ac81fbeda18adf14d222717ba8985431c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other domains, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b502c5eb4bb---19627657157.pdf In PDF document text
    • https://heuresromantiques.com/upload/files/dekaxaminitoreje.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c6c320357923f73aa23841067ea1cbeb/45634492688.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/489af2bdfa726bc9f3bb84a1315ae195/vekumudolifazevigoje.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/27464827549.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/ramodomere.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/wipogixapopufutoguga.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/44383462583.pdfIn PDF document text
    • http://wenxuezj.com/images/File/bolaxukagukijawules.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5339de7c4afcf1e252fd3ef82960d6f4/xexinobofapidarolonegor.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/56188785723.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/67994946533.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d1f1456b78e07dcec0c8906355038584/kejaluxalaraj.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fd30238ebe85d4a3745b916b2d91696a/99778228002.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/fe9c06f0377f4b6eea26705973877530/munoxedewudokimolamobol.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b7446930---84554455396.pdfIn PDF document text
    • http://santeh.md/img/files/nopuvima.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d06c4914---zezufi.pdfIn PDF document text
    • http://bronia.org/userfiles/file/buvakirix.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/nefamajasewimom.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/40567272208.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/51245496826.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194562b38f8---28410524574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A7%D8%A8+%D8%B4%D8%B1%D8%AD+%D8%A7%D9%84%D8%AA%D8%AD%D8%A7%D9%84%D9%8A%D9%84+%D8%A7%D9%84%D8%B7%D8%A8%D9%8A%D8%A9+%D9%85%D8%AC%D8%A7%D9%86%D8%A7+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e9f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9F7 24960 bytes
SHA-256: 326e9e83e384ceb2e712e836f1154ca735574f1c3fec937b5bb0c36c7372765a
font_00_sfnt_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 19048 bytes
SHA-256: 3541b96e50ba0c905311292a4897af8d55ee140cc31382a292ee8afbf14a032a
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 21400 bytes
SHA-256: 2fb8ef022db88f4e404b14690c7e7cfa90b97c847504a89630127b1265078f21
font_03_sfnt_off00014c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C82 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724

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